| Image Thumbs | |
| Cert Num | 1393863 |
| Cert Date | 2021-04-19 |
| Catalog Number | C5 |
| Country | USA |
| Year | 1923 |
| Denom | 16c |
| Color | Dark blue |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, block of four. |
| Cert Link | http://psestamp.com/Cert/1393863 |